One of the last days, NATO killed 24 Pakistani soldiers. Pakistan is outraged.

It's tragic if people are killed from an error, but what about the Pakistan double play? They have secretly HELPED THE TALIBAN since 2001 and as a result of this, US and NATO forces have suffered thousands of casualties. Pakistan knows that helping Taliban indirectly is killing Afghan and international forces. And they are outraged when a small number of Pakistani troops are killed by accident?

Some sources even suggests that Pakistani troops might have provoked the attack:

Pakistani Officials Deny Reports That Fire From Pakistan Led to Attackfoxnews.com